With a June release for Firefox 5 (scheduled), this link tells what Mozilla developers are implementing very soon. Every 2 to 4 months (max) they expect to put out a new release. Apple tried that with 1 year releases on OSX and had to go back to 2 years releases and Microsoft doesn't even try to meet such a short turnaround.

QuoteAlso, it more and more looks as if SeaMonkey will chime in with the rapid release process and produce small but fast updates in the future, which also should get exciting.

For long time I've been using firefox betas (before its 1.0 first official rel) because it was lean, fast, and had no useless junk built-in. But as soon as bloat started to pour-in into this once fine browser, around version 0.6 or 0.72 or 0.9 (been long time, I'm sure I'm confusing FF versions with K-M versions), anyways it was obvious in which direction it will go, and that's when I decided to switch to K-Meleon for good (it also helped that K-M got updated to a very usable browser at that time).
Do you see where I'm going with it?
I, for instance, couldn't care less if new firefox is released on a weekly basis.
All the changes I have seen in all firefox versions are just more bloat, with very seldom truly useful feature that most users would need or desire. That's the reason why I'm still using K-Meleon. The only thing that K-M needs is official gecko updates (which ought to be posted on the main page next to the official downloads, as I always ask for this...).
Want bloated browser or need to install newer browser versions every few weeks? Well, there is firefox for that.
I don't want it, and I'm sure neither do most of K-Meleon users.

Quotendebord
With a June release for Firefox 5 (scheduled), this link tells what Mozilla developers are implementing very soon. Every 2 to 4 months (max) they expect to put out a new release. Apple tried that with 1 year releases on OSX and had to go back to 2 years releases and Microsoft doesn't even try to meet such a short turnaround.

Okay, every six weeks a few more bugfixes
So it looks like they switched from "major changes" on X.X.0 numbers and yet bigger ones on full numbers X.0.0, to major changes on X0.0.0 - just moving a dot one number to the left side, who cares? Cannot take that idiocy seriously sorry, it's just playing with numbers like faking (oops polishing) statistics...

Quotesiria
Okay, every six weeks a few more bugfixes
So it looks like they switched from "major changes" on X.X.0 numbers and yet bigger ones on full numbers X.0.0, to major changes on X0.0.0 - just moving a dot one number to the left side, who cares? Cannot take that idiocy seriously sorry, it's just playing with numbers like faking (oops polishing) statistics...

Siria,

Siria,

The weasel (G) in the hen house is Debian, which uses FF 3.6.xx for its iceweasal version of FireFox. According to what I've read, they want to keep using Gecko 1.9.xxx for now, which is good for KM 1.7.

Just read this from MacWorld. "Mozilla has decided to issue at least one more security update for that edition, which shipped in January 2010. The update, to be pegged 3.6.19, will be released alongside Firefox 6 when the latter ships on Aug. 16."

QuoteStephen Shankland
For years, an extension called Firebug has been a powerful tool that kept Web programmers loyal to Firefox.

QuoteJohn J. Barton
Basing next gen work on Firebug is not practical. The pace of change in browsers is too fast for our team size. Firebug hasn't really been able to keep up with Firefox, let alone compete with other tools.

So IMHO there seem to be some casualties of Mozilla's new rapid-release program for Firefox.